21491913

素因数分解:

$3^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{71}}^1\times {\mathrm{107}}^1$

素因数の和:245

約数の個数: 32

約数和(自身を含む): 31352832

約数和(自身を除く): 9860919

約数列:

[1, 3, 23, 41, 69, 71, 107, 123, 213, 321, 943, 1633, 2461, 2829, 2911, 4387, 4899, 7383, 7597, 8733, 13161, 22791, 66953, 100901, 174731, 200859, 302703, 311477, 524193, 934431, 7163971, 21491913]

約数ペア:

[(1, 21491913), (3, 7163971), (23, 934431), (41, 524193), (69, 311477), (71, 302703), (107, 200859), (123, 174731), (213, 100901), (321, 66953), (943, 22791), (1633, 13161), (2461, 8733), (2829, 7597), (2911, 7383), (4387, 4899)]